Formation of anisotropic Tl-1212, Tl-2212, Tl-1223 and Tl-2223 particles using aerosol flow reacted powders
Highly anisotropic particles of Tl-1212, Tl-2212, Tl-1223 and Tl-2223 superconductors were grown. The Tl-free precursor powders with the compositions Ba{sub 1}Ca{sub 2}Cu{sub 3}Ag{sub 0.37}O{sub 6} and Ba{sub 2}Ca{sub 2}Cu{sub 3}Ag{sub 0.37}O{sub 7} were prepared using an aerosol flow reactor. These precursor powders were then post-annealed in 0.1 atm oxygen at 700 C for 4h to reduce the carbon present and mixed with Tl{sub 2}O{sub 3} (typical composition of Tl{sub x}; x = 0.6--1.0). The Tl-containing powders were heated in sealed gold tubes between 650--890 C for various times. X-ray diffraction showed that the Tl-2212 and Tl-2223 phases were stable over a wide range of temperatures. Scanning electron microscopy showed evidence for the presence of high aspect-ratio particles. These highly anisotropic particles may be of interest for the preparation of powder-in-tube and other powder deposited conductors, for current leads, and for grain alignment studies.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Oak Ridge Inst. for Science and Education, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 28370
- Report Number(s):
- CONF-941013-28; ON: DE95007400; TRN: AHC29510%%175
- Resource Relation:
- Conference: Applied superconductivity conference, Boston, MA (United States), 16-21 Oct 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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